One problem related to starter solenoid has been reported for the 2004 Ford Taurus. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Ford Taurus based on all problems reported for the 2004 Taurus.
While driving on the highway (50 - 60 mph), the car stalls, all the lights turn off including the hazard flashers. Braking and steering then become very difficult. I always put the car into neutral and attempt to coast to a safe parking location. I am able to restart the vehicle sometimes immediately, sometimes after prolonged periods. So far, the stall problem has never occurred while the vehicle was at rest. Sometimes the door locks will briefly "chatter" as the solenoids mysteriously activate. This can occur while driving or idling. The problem first occurred in June 2015. Then recurred randomly once every 2-3 weeks. Recently, the problem occurs 2-3 times in a day. The problem does not persist long enough to be diagnosed.